package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebFilter(filterName = "LoginFilter", urlPatterns = "/*")
@Slf4j
public class LoginFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse , FilterChain chain) throws ServletException, IOException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response     = (HttpServletResponse) servletResponse;

//        String uri = req.getRequestURI().toString();
        //判断资源路径是否和登陆注册相关
        String[] args = new String[]{ "/employee/login","/employee/logout", "/backend/**", "/front/**", "/common/**",
                "/user/sendMsg",
                "/user/login"};

        //获取当前访问的资源路径
        String uri = request.getRequestURI();
//
        //判断session中是否有有user
//        HttpSession session = req.getSession();
//        Object user = session.getAttribute("employee");
//        if (user!=null){
//            //登录直接放行
//            //放行
//            chain.doFilter(req, res);
//        }else {
//            //没登陆需要拦截
//         res.getWriter().write(JSON.toJSONString(R.error("NOLOGIN")));
//            return;
//        }
        
        //第二种方法
        //2、判断本次请求是否需要处理
        boolean check = check(args, uri);

        //3、如果不需要处理，则直接放行
        if (check) {
            log.info("本次请求{}不需要处理", uri);
            chain.doFilter(request, response);
            return;
        }

        //4、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("employee"));
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            chain.doFilter(request, response);
            return;
        }

        //4-2、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            chain.doFilter(request,response);
            return;
        }


        log.info("用户未登录");
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }


//拦截方法
public boolean check(String[] urls, String requestURI) {
    for (String url : urls) {
        boolean match = PATH_MATCHER.match(url, requestURI);
        if (match) {
            return true;   //只要其中一个符合就放行
        }
    }
    return false;
}
}
